Still from American Sniper. The comic is never named, but if you look closely, you can see that it's issue No. 1 of the sixth volume of Punisher, released in January of 2004 (making it very believable as something Biggles could be reading during the platoon's 2004 deployment).
A Dr. Garry Choy, MD, Diagnostic Radiology, answered. Radiation fibrosis is the result of prior radiation exposure that results in scarring of an organ such as breasts, lungs, etc. Post radiation treatment fibrosis is the typical cause.
These symptoms begin about the second week of treatment and may get worse during treatment. Most symptoms will start to improve about 2 weeks after treatment has ended. Radiation therapy can also cause permanent tissue scarring. The effects of this scarring depend on the area that was treated. Below are some effects of scarring: The muscles attached to your jaw may tighten and make it difficult to open your mouth and chew your food.